Web severing device



July 18,- 1933. E. H. LAABS WEB SEVERING DEVICE Filed. April 22, 1932 l aten ted July 18, 1933 UNITED STATES PATENT OFFICE ERIC H. LAABS, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO CUTLER-HAMMER, INC., 0

MILWAUKEE, WISCONSIN, A CORPORATION 01 DELAWARE WEB SEVERING DEVICE Application filed April 22,

This invention relates to web severing de The present invention isparticularly sip-- plicable to web severing devices for installations of the aforesaid character and has among its objects to simplify and generally improve the construction and operation of such devices.

Another object is to provide a web severing device having cutting parts .which are normally concealed to prevent clogging of the device by paper lint and to also prevent injury to an operator during web threading operations.

Another object is to provide a device of the aforesaid character which is designed to facilitate and expedite installation thereof upon a press.

Various other objects and advantages of the invention will hereinafter appear.

The accompanying drawing illustrates an embodiment of the invention which will now be described, it being understood that various modifications may be made in the embodiment illustrated without departing from the spirit and scope of the appended claims.

In the drawing,

Figure 1 is a side view of a web severing device embodying the invention, portions of the device being broken away and shown in section;

Fig. 2 is a sectional view of a portion at one end of the device shown in Fig. 1, and

Fig. 3 is a sectional view on line 33 of Fig. 1.

The device illustrated in Fig. 1 includes a plurality of knives 1 carried by a tubular bridge member 2, said knives being normally concealed within said bridge member and 1932. Serial No. 806,788.

being movable outwardly through openings 3 therein by a solenoid 4.

' More specifically, knives 1 are each mount.- ed upon a pivot pin 5 carried by a bar 6 which is fixed to the inner wall of bridge member 2 by screws 7. Bar 6 is rovided with spaced recesses 8 for receiving t e upper ends of knives 1, and said knives are arranged to swing upon their associated pivot pins in a common plane substantially diametric with respect to the axis of bridge member 2. A pair of links 9-9 arranged on opposite sides of the knives 1 and connected thereto by pivot pins 10 provide for simultaneous movement of said nives between the full and dotted line positions illustrated in Fig. 1.

It will be noted that when the knives are positioned as shown in full lines in Fig. 1 the lower ends thereof are concealed within the bridge member 2. However, upon movement of said knives'into the positions illustrated by dotted lines the lower ends thereof are projected through the openings 3 in bridge. member 2, for engagement with a traveling web. Upon movement of they knives into their projected positions the same are adapted to cut or puncture the traveling web at a plurality of points, and as is well known a tensioned web is then adapted to tear between such points. To facilitate cutting or puncturing of the web the lower ends of the knives are preferably V-shaped as shown in the drawing.

The operating solenoid 4 is mounted upon one end of bridge member 2 and a cup-shaped member 11 is mounted upon the opposite end thereof. The operatin solenoid 4 includes a winding 13 coiled a out a non-magnetic tubular sleeve 14, a magnetic enclosing casing 15 for said winding and a plunger 16 which is reciprocable within said sleeve. Plunger 16 is operatively connected to the knives 1 by a link 17, one end of said link being pivotally connected to the outer end of said plunger by a pin 18 and the opposite end thereof being connected to the links 9-9 by a pivot pin 19. Plunger 16 is biased to move towards the left by a coil spring 20 to normally hold the knives 1 in their retracted positions and upon energization of the winding 13 said plunger is attracted towards themight to swing said knives into their pro ected positions.

More specifically, magnet frame 15 includes a cup-shaped member 21 for receiv ng the winding 13 and an end member 22 which fits within the open end of said former member. Cup member 21 is secured to end member 22 by screws 23 and said end member is provided with a center opening for rece ving the plunger 16 and is also provided with a projection 24 which fits within the bridge member 2 and is secured thereto by screws 25. The sleeve 14 upon which the windlng 13 is coiled is supported at one end within a counterbore in end member 22 and its opposite end is supported by a cylindrical magnetic core 26 which fits within said sleeve and is secured to the end wall of cupmember 21 by a screw 27. Winding 13 is held against axial movement upon sleeve 14 by a plurality of coil springs 28 which are held under compression between the left hand end of said winding and end member 22. The inner end of plunger 16 is provided with a portion 29 of reduced diameter which projects into the coil spring 20, and said spring is held under compression between the shoulder formed by portion 29 on said plunger and the magnetic plug 26. Movement of plunger 16 under the action of spring 20 is limited by a stop 30 which is fixed to the bar 6 and is'arranged to engage the left hand end'of said plunger. Movement of plunger 16 towards the rlght under the action of the operating winding 13 is limited by a non-magnetic stop pin 31 mounted upon the face of core 26, said stop being arranged to prevent sealing of said plunger with the face of said core.

The device 'is designed to be fixed at opposite ends upon suitable supports, as for example the side frames of a printing ress. For this purpose cup member 11 an cup member 21 of the magnet frame are respectively provided with projecting mounting flanges 32 and 33, each of which is drilled as shown in Fig. 3, to receive a plurality of securing bolts or screws. Cup member 11 is secured to bridge member 2 by set screws 34, and as is apparent, by loosening said set screws said cup member may be adjusted axially with respect to said bridge member to suit the distance between the side frames of a printing press or other supporting structure.

As shown in Fig. 2, cup member 21 of the magnet frame is provided with openings for receiving terminals 35 and 36 on winding 13 and a conduit box 37 is provided for receiving the wires connected to said terminals. Said conduit box is secured to cup member 21 by screws 38 and the same includes interfitting sections 39 and 40, the latter section being provided with an opening for receiving a conduit 41.

mally concealed within said member and adapted to be projected outwardly through openings therein, and an operating solenoid for said mechanism mounted upon one end of said tubular member and responsive to effect projection of said web severing parts.

2. A web severing device comprising a hollow cylindrical supporting member, a plu:

rality of knives arranged within said member and pivotally secured thereto to swing in a common plane substantially diametric with respect to the axis of said member, said knives being normally concealed within said supporting member and the free ends thereof being movable outwardly through openings therein, and a solenoid mounted upon one end of said member, said solenoid having a plunger movable axially with respect to said supporting member, and link connections between said plunger and said knives.

3. A web severing device comprising a hol low cylindrical supporting member, a plurality of knives mounted within said member and arranged to swing in a common plane substantially diametric with respect to the axis of said member, said knives being normally concealed within said supporting member and the free ends thereof being movable outwardly through openings therein, and an operating solenoid for said knives including a winding, a magnetic enclosing casing for said winding secured to one end of said supporting member and a plunger located within an opening in said winding and operatively connected to said knives, said plunger being movable into an attracted position to effect simultaneous outward movement of said knives through the openings in said tubular member.

4. In a device for severing a traveling web, in combination, a stationary bridge member, a web puncturing mechanism carried thereby, said mechanism being normally concealed by said bridge member and being movable into a projected position with respect thereto for engagement with the traveling web, means for biasing said mechanism towards normal position, and an electroma netic operating device mounted upon said brldge member for moving said mechanism into its projected position.

5. In a device for severing a traveling web, in combination, an elongated stationary bridge member, a plurality of web puncturing knives mounted upon said member and spaced lengthwise with respect thereto, said knives being normally concealed by said member and being movable into projected positions with respect thereto, for engagemember and a position wherein the same projects therebeyond for engagement with the traveling web, spring means normally holding said knives in their concealed positions, and an operating solenoid mounted upon said bridge member including a stationary operating winding having a plunger reciprocably mounted therein, said plunger being opera tively connected to said knives to effect simultaneous movement thereof into their projected positions. I ERIC H. LAABS. 

